include/sound/pcm.h

   1 #ifndef __SOUND_PCM_H
   2 #define __SOUND_PCM_H
   3
   4 /*
   5  *  Digital Audio (PCM) abstract layer
   6  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   7  *                   Abramo Bagnara <abramo@alsa-project.org>
   8  *
   9  *
  10  *   This program is free software; you can redistribute it and/or modify
  11  *   it under the terms of the GNU General Public License as published by
  12  *   the Free Software Foundation; either version 2 of the License, or
  13  *   (at your option) any later version.
  14  *
  15  *   This program is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *   GNU General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU General Public License
  21  *   along with this program; if not, write to the Free Software
  22  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  23  *
  24  */
  25
  26 #include <sound/asound.h>
  27 #include <sound/memalloc.h>
  28 #include <linux/poll.h>
  29 #include <linux/mm.h>
  30 #include <linux/bitops.h>
  31
  32 #define snd_pcm_substream_chip(substream) ((substream)->private_data)
  33 #define snd_pcm_chip(pcm) ((pcm)->private_data)
  34
  35 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
  36 #include "pcm_oss.h"
  37 #endif
  38
  39 /*
  40  *  Hardware (lowlevel) section
  41  */
  42
  43 struct snd_pcm_hardware {
  44         unsigned int info;              /* SNDRV_PCM_INFO_* */
  45         u64 formats;                    /* SNDRV_PCM_FMTBIT_* */
  46         unsigned int rates;             /* SNDRV_PCM_RATE_* */
  47         unsigned int rate_min;          /* min rate */
  48         unsigned int rate_max;          /* max rate */
  49         unsigned int channels_min;      /* min channels */
  50         unsigned int channels_max;      /* max channels */
  51         size_t buffer_bytes_max;        /* max buffer size */
  52         size_t period_bytes_min;        /* min period size */
  53         size_t period_bytes_max;        /* max period size */
  54         unsigned int periods_min;       /* min # of periods */
  55         unsigned int periods_max;       /* max # of periods */
  56         size_t fifo_size;               /* fifo size in bytes */
  57 };
  58
  59 struct snd_pcm_substream;
  60
  61 struct snd_pcm_ops {
  62         int (*open)(struct snd_pcm_substream *substream);
  63         int (*close)(struct snd_pcm_substream *substream);
  64         int (*ioctl)(struct snd_pcm_substream * substream,
  65                      unsigned int cmd, void *arg);
  66         int (*hw_params)(struct snd_pcm_substream *substream,
  67                          struct snd_pcm_hw_params *params);
  68         int (*hw_free)(struct snd_pcm_substream *substream);
  69         int (*prepare)(struct snd_pcm_substream *substream);
  70         int (*trigger)(struct snd_pcm_substream *substream, int cmd);
  71         snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
  72         int (*copy)(struct snd_pcm_substream *substream, int channel,
  73                     snd_pcm_uframes_t pos,
  74                     void __user *buf, snd_pcm_uframes_t count);
  75         int (*silence)(struct snd_pcm_substream *substream, int channel,
  76                        snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
  77         struct page *(*page)(struct snd_pcm_substream *substream,
  78                              unsigned long offset);
  79         int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
  80         int (*ack)(struct snd_pcm_substream *substream);
  81 };
  82
  83 /*
  84  *
  85  */
  86
  87 #define SNDRV_PCM_DEVICES               8
  88
  89 #define SNDRV_PCM_IOCTL1_FALSE          ((void *)0)
  90 #define SNDRV_PCM_IOCTL1_TRUE           ((void *)1)
  91
  92 #define SNDRV_PCM_IOCTL1_RESET          0
  93 #define SNDRV_PCM_IOCTL1_INFO           1
  94 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO   2
  95 #define SNDRV_PCM_IOCTL1_GSTATE         3
  96
  97 #define SNDRV_PCM_TRIGGER_STOP          0
  98 #define SNDRV_PCM_TRIGGER_START         1
  99 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH    3
 100 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
 101 #define SNDRV_PCM_TRIGGER_SUSPEND       5
 102 #define SNDRV_PCM_TRIGGER_RESUME        6
 103
 104 #define SNDRV_PCM_POS_XRUN              ((snd_pcm_uframes_t)-1)
 105
 106 /* If you change this don't forget to change rates[] table in pcm_native.c */
 107 #define SNDRV_PCM_RATE_5512             (1<<0)          /* 5512Hz */
 108 #define SNDRV_PCM_RATE_8000             (1<<1)          /* 8000Hz */
 109 #define SNDRV_PCM_RATE_11025            (1<<2)          /* 11025Hz */
 110 #define SNDRV_PCM_RATE_16000            (1<<3)          /* 16000Hz */
 111 #define SNDRV_PCM_RATE_22050            (1<<4)          /* 22050Hz */
 112 #define SNDRV_PCM_RATE_32000            (1<<5)          /* 32000Hz */
 113 #define SNDRV_PCM_RATE_44100            (1<<6)          /* 44100Hz */
 114 #define SNDRV_PCM_RATE_48000            (1<<7)          /* 48000Hz */
 115 #define SNDRV_PCM_RATE_64000            (1<<8)          /* 64000Hz */
 116 #define SNDRV_PCM_RATE_88200            (1<<9)          /* 88200Hz */
 117 #define SNDRV_PCM_RATE_96000            (1<<10)         /* 96000Hz */
 118 #define SNDRV_PCM_RATE_176400           (1<<11)         /* 176400Hz */
 119 #define SNDRV_PCM_RATE_192000           (1<<12)         /* 192000Hz */
 120
 121 #define SNDRV_PCM_RATE_CONTINUOUS       (1<<30)         /* continuous range */
 122 #define SNDRV_PCM_RATE_KNOT             (1<<31)         /* supports more non-continuos rates */
 123
 124 #define SNDRV_PCM_RATE_8000_44100       (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
 125                                          SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
 126                                          SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
 127 #define SNDRV_PCM_RATE_8000_48000       (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
 128 #define SNDRV_PCM_RATE_8000_96000       (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
 129                                          SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
 130 #define SNDRV_PCM_RATE_8000_192000      (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
 131                                          SNDRV_PCM_RATE_192000)
 132 #define SNDRV_PCM_FMTBIT_S8             (1ULL << SNDRV_PCM_FORMAT_S8)
 133 #define SNDRV_PCM_FMTBIT_U8             (1ULL << SNDRV_PCM_FORMAT_U8)
 134 #define SNDRV_PCM_FMTBIT_S16_LE         (1ULL << SNDRV_PCM_FORMAT_S16_LE)
 135 #define SNDRV_PCM_FMTBIT_S16_BE         (1ULL << SNDRV_PCM_FORMAT_S16_BE)
 136 #define SNDRV_PCM_FMTBIT_U16_LE         (1ULL << SNDRV_PCM_FORMAT_U16_LE)
 137 #define SNDRV_PCM_FMTBIT_U16_BE         (1ULL << SNDRV_PCM_FORMAT_U16_BE)
 138 #define SNDRV_PCM_FMTBIT_S24_LE         (1ULL << SNDRV_PCM_FORMAT_S24_LE)
 139 #define SNDRV_PCM_FMTBIT_S24_BE         (1ULL << SNDRV_PCM_FORMAT_S24_BE)
 140 #define SNDRV_PCM_FMTBIT_U24_LE         (1ULL << SNDRV_PCM_FORMAT_U24_LE)
 141 #define SNDRV_PCM_FMTBIT_U24_BE         (1ULL << SNDRV_PCM_FORMAT_U24_BE)
 142 #define SNDRV_PCM_FMTBIT_S32_LE         (1ULL << SNDRV_PCM_FORMAT_S32_LE)
 143 #define SNDRV_PCM_FMTBIT_S32_BE         (1ULL << SNDRV_PCM_FORMAT_S32_BE)
 144 #define SNDRV_PCM_FMTBIT_U32_LE         (1ULL << SNDRV_PCM_FORMAT_U32_LE)
 145 #define SNDRV_PCM_FMTBIT_U32_BE         (1ULL << SNDRV_PCM_FORMAT_U32_BE)
 146 #define SNDRV_PCM_FMTBIT_FLOAT_LE       (1ULL << SNDRV_PCM_FORMAT_FLOAT_LE)
 147 #define SNDRV_PCM_FMTBIT_FLOAT_BE       (1ULL << SNDRV_PCM_FORMAT_FLOAT_BE)
 148 #define SNDRV_PCM_FMTBIT_FLOAT64_LE     (1ULL << SNDRV_PCM_FORMAT_FLOAT64_LE)
 149 #define SNDRV_PCM_FMTBIT_FLOAT64_BE     (1ULL << SNDRV_PCM_FORMAT_FLOAT64_BE)
 150 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
 151 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE)
 152 #define SNDRV_PCM_FMTBIT_MU_LAW         (1ULL << SNDRV_PCM_FORMAT_MU_LAW)
 153 #define SNDRV_PCM_FMTBIT_A_LAW          (1ULL << SNDRV_PCM_FORMAT_A_LAW)
 154 #define SNDRV_PCM_FMTBIT_IMA_ADPCM      (1ULL << SNDRV_PCM_FORMAT_IMA_ADPCM)
 155 #define SNDRV_PCM_FMTBIT_MPEG           (1ULL << SNDRV_PCM_FORMAT_MPEG)
 156 #define SNDRV_PCM_FMTBIT_GSM            (1ULL << SNDRV_PCM_FORMAT_GSM)
 157 #define SNDRV_PCM_FMTBIT_SPECIAL        (1ULL << SNDRV_PCM_FORMAT_SPECIAL)
 158 #define SNDRV_PCM_FMTBIT_S24_3LE        (1ULL << SNDRV_PCM_FORMAT_S24_3LE)
 159 #define SNDRV_PCM_FMTBIT_U24_3LE        (1ULL << SNDRV_PCM_FORMAT_U24_3LE)
 160 #define SNDRV_PCM_FMTBIT_S24_3BE        (1ULL << SNDRV_PCM_FORMAT_S24_3BE)
 161 #define SNDRV_PCM_FMTBIT_U24_3BE        (1ULL << SNDRV_PCM_FORMAT_U24_3BE)
 162 #define SNDRV_PCM_FMTBIT_S20_3LE        (1ULL << SNDRV_PCM_FORMAT_S20_3LE)
 163 #define SNDRV_PCM_FMTBIT_U20_3LE        (1ULL << SNDRV_PCM_FORMAT_U20_3LE)
 164 #define SNDRV_PCM_FMTBIT_S20_3BE        (1ULL << SNDRV_PCM_FORMAT_S20_3BE)
 165 #define SNDRV_PCM_FMTBIT_U20_3BE        (1ULL << SNDRV_PCM_FORMAT_U20_3BE)
 166 #define SNDRV_PCM_FMTBIT_S18_3LE        (1ULL << SNDRV_PCM_FORMAT_S18_3LE)
 167 #define SNDRV_PCM_FMTBIT_U18_3LE        (1ULL << SNDRV_PCM_FORMAT_U18_3LE)
 168 #define SNDRV_PCM_FMTBIT_S18_3BE        (1ULL << SNDRV_PCM_FORMAT_S18_3BE)
 169 #define SNDRV_PCM_FMTBIT_U18_3BE        (1ULL << SNDRV_PCM_FORMAT_U18_3BE)
 170
 171 #ifdef SNDRV_LITTLE_ENDIAN
 172 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_LE
 173 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_LE
 174 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_LE
 175 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_LE
 176 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_LE
 177 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_LE
 178 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_LE
 179 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_LE
 180 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
 181 #endif
 182 #ifdef SNDRV_BIG_ENDIAN
 183 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_BE
 184 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_BE
 185 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_BE
 186 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_BE
 187 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_BE
 188 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_BE
 189 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_BE
 190 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_BE
 191 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
 192 #endif
 193
 194 struct snd_pcm_file {
 195         struct snd_pcm_substream *substream;
 196         int no_compat_mmap;
 197 };
 198
 199 struct snd_pcm_hw_rule;
 200 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
 201                                       struct snd_pcm_hw_rule *rule);
 202
 203 struct snd_pcm_hw_rule {
 204         unsigned int cond;
 205         snd_pcm_hw_rule_func_t func;
 206         int var;
 207         int deps[4];
 208         void *private;
 209 };
 210
 211 struct snd_pcm_hw_constraints {
 212         struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
 213                          SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
 214         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
 215                              SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
 216         unsigned int rules_num;
 217         unsigned int rules_all;
 218         struct snd_pcm_hw_rule *rules;
 219 };
 220
 221 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
 222                                             snd_pcm_hw_param_t var)
 223 {
 224         return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 225 }
 226
 227 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
 228                                                     snd_pcm_hw_param_t var)
 229 {
 230         return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 231 }
 232
 233 struct snd_ratnum {
 234         unsigned int num;
 235         unsigned int den_min, den_max, den_step;
 236 };
 237
 238 struct snd_ratden {
 239         unsigned int num_min, num_max, num_step;
 240         unsigned int den;
 241 };
 242
 243 struct snd_pcm_hw_constraint_ratnums {
 244         int nrats;
 245         struct snd_ratnum *rats;
 246 };
 247
 248 struct snd_pcm_hw_constraint_ratdens {
 249         int nrats;
 250         struct snd_ratden *rats;
 251 };
 252
 253 struct snd_pcm_hw_constraint_list {
 254         unsigned int count;
 255         unsigned int *list;
 256         unsigned int mask;
 257 };
 258
 259 struct snd_pcm_runtime {
 260         /* -- Status -- */
 261         struct snd_pcm_substream *trigger_master;
 262         struct timespec trigger_tstamp; /* trigger timestamp */
 263         int overrange;
 264         snd_pcm_uframes_t avail_max;
 265         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
 266         snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time*/
 267
 268         /* -- HW params -- */
 269         snd_pcm_access_t access;        /* access mode */
 270         snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
 271         snd_pcm_subformat_t subformat;  /* subformat */
 272         unsigned int rate;              /* rate in Hz */
 273         unsigned int channels;          /* channels */
 274         snd_pcm_uframes_t period_size;  /* period size */
 275         unsigned int periods;           /* periods */
 276         snd_pcm_uframes_t buffer_size;  /* buffer size */
 277         snd_pcm_uframes_t min_align;    /* Min alignment for the format */
 278         size_t byte_align;
 279         unsigned int frame_bits;
 280         unsigned int sample_bits;
 281         unsigned int info;
 282         unsigned int rate_num;
 283         unsigned int rate_den;
 284
 285         /* -- SW params -- */
 286         int tstamp_mode;                /* mmap timestamp is updated */
 287         unsigned int period_step;
 288         snd_pcm_uframes_t start_threshold;
 289         snd_pcm_uframes_t stop_threshold;
 290         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
 291                                                 noise is nearest than this */
 292         snd_pcm_uframes_t silence_size; /* Silence filling size */
 293         snd_pcm_uframes_t boundary;     /* pointers wrap point */
 294
 295         snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
 296         snd_pcm_uframes_t silence_filled; /* size filled with silence */
 297
 298         union snd_pcm_sync_id sync;     /* hardware synchronization ID */
 299
 300         /* -- mmap -- */
 301         struct snd_pcm_mmap_status *status;
 302         struct snd_pcm_mmap_control *control;
 303
 304         /* -- locking / scheduling -- */
 305         wait_queue_head_t sleep;
 306         struct fasync_struct *fasync;
 307
 308         /* -- private section -- */
 309         void *private_data;
 310         void (*private_free)(struct snd_pcm_runtime *runtime);
 311
 312         /* -- hardware description -- */
 313         struct snd_pcm_hardware hw;
 314         struct snd_pcm_hw_constraints hw_constraints;
 315
 316         /* -- interrupt callbacks -- */
 317         void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
 318         void (*transfer_ack_end)(struct snd_pcm_substream *substream);
 319
 320         /* -- timer -- */
 321         unsigned int timer_resolution;  /* timer resolution */
 322         int tstamp_type;                /* timestamp type */
 323
 324         /* -- DMA -- */
 325         unsigned char *dma_area;        /* DMA area */
 326         dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
 327         size_t dma_bytes;               /* size of DMA area */
 328
 329         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
 330
 331 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 332         /* -- OSS things -- */
 333         struct snd_pcm_oss_runtime oss;
 334 #endif
 335 };
 336
 337 struct snd_pcm_group {          /* keep linked substreams */
 338         spinlock_t lock;
 339         struct list_head substreams;
 340         int count;
 341 };
 342
 343 struct snd_pcm_substream {
 344         struct snd_pcm *pcm;
 345         struct snd_pcm_str *pstr;
 346         void *private_data;             /* copied from pcm->private_data */
 347         int number;
 348         char name[32];                  /* substream name */
 349         int stream;                     /* stream (direction) */
 350         char latency_id[20];            /* latency identifier */
 351         size_t buffer_bytes_max;        /* limit ring buffer size */
 352         struct snd_dma_buffer dma_buffer;
 353         unsigned int dma_buf_id;
 354         size_t dma_max;
 355         /* -- hardware operations -- */
 356         struct snd_pcm_ops *ops;
 357         /* -- runtime information -- */
 358         struct snd_pcm_runtime *runtime;
 359         /* -- timer section -- */
 360         struct snd_timer *timer;                /* timer */
 361         unsigned timer_running: 1;      /* time is running */
 362         spinlock_t timer_lock;
 363         /* -- next substream -- */
 364         struct snd_pcm_substream *next;
 365         /* -- linked substreams -- */
 366         struct list_head link_list;     /* linked list member */
 367         struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
 368         struct snd_pcm_group *group;            /* pointer to current group */
 369         /* -- assigned files -- */
 370         void *file;
 371         int ref_count;
 372         atomic_t mmap_count;
 373         unsigned int f_flags;
 374         void (*pcm_release)(struct snd_pcm_substream *);
 375 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 376         /* -- OSS things -- */
 377         struct snd_pcm_oss_substream oss;
 378 #endif
 379 #ifdef CONFIG_SND_VERBOSE_PROCFS
 380         struct snd_info_entry *proc_root;
 381         struct snd_info_entry *proc_info_entry;
 382         struct snd_info_entry *proc_hw_params_entry;
 383         struct snd_info_entry *proc_sw_params_entry;
 384         struct snd_info_entry *proc_status_entry;
 385         struct snd_info_entry *proc_prealloc_entry;
 386         struct snd_info_entry *proc_prealloc_max_entry;
 387 #endif
 388         /* misc flags */
 389         unsigned int hw_opened: 1;
 390 };
 391
 392 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
 393
 394
 395 struct snd_pcm_str {
 396         int stream;                             /* stream (direction) */
 397         struct snd_pcm *pcm;
 398         /* -- substreams -- */
 399         unsigned int substream_count;
 400         unsigned int substream_opened;
 401         struct snd_pcm_substream *substream;
 402 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 403         /* -- OSS things -- */
 404         struct snd_pcm_oss_stream oss;
 405 #endif
 406 #ifdef CONFIG_SND_VERBOSE_PROCFS
 407         struct snd_info_entry *proc_root;
 408         struct snd_info_entry *proc_info_entry;
 409 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 410         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
 411         struct snd_info_entry *proc_xrun_debug_entry;
 412 #endif
 413 #endif
 414 };
 415
 416 struct snd_pcm {
 417         struct snd_card *card;
 418         struct list_head list;
 419         unsigned int device;    /* device number */
 420         unsigned int info_flags;
 421         unsigned short dev_class;
 422         unsigned short dev_subclass;
 423         char id[64];
 424         char name[80];
 425         struct snd_pcm_str streams[2];
 426         struct mutex open_mutex;
 427         wait_queue_head_t open_wait;
 428         void *private_data;
 429         void (*private_free) (struct snd_pcm *pcm);
 430         struct device *dev; /* actual hw device this belongs to */
 431 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 432         struct snd_pcm_oss oss;
 433 #endif
 434 };
 435
 436 struct snd_pcm_notify {
 437         int (*n_register) (struct snd_pcm * pcm);
 438         int (*n_disconnect) (struct snd_pcm * pcm);
 439         int (*n_unregister) (struct snd_pcm * pcm);
 440         struct list_head list;
 441 };
 442
 443 /*
 444  *  Registering
 445  */
 446
 447 extern const struct file_operations snd_pcm_f_ops[2];
 448
 449 int snd_pcm_new(struct snd_card *card, char *id, int device,
 450                 int playback_count, int capture_count,
 451                 struct snd_pcm **rpcm);
 452 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 453
 454 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 455
 456 /*
 457  *  Native I/O
 458  */
 459
 460 extern rwlock_t snd_pcm_link_rwlock;
 461
 462 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
 463 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 464                       struct snd_pcm_info __user *info);
 465 int snd_pcm_status(struct snd_pcm_substream *substream,
 466                    struct snd_pcm_status *status);
 467 int snd_pcm_start(struct snd_pcm_substream *substream);
 468 int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
 469 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
 470 #ifdef CONFIG_PM
 471 int snd_pcm_suspend(struct snd_pcm_substream *substream);
 472 int snd_pcm_suspend_all(struct snd_pcm *pcm);
 473 #endif
 474 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
 475 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
 476                            struct snd_pcm_substream **rsubstream);
 477 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
 478 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
 479                              struct snd_pcm_substream **rsubstream);
 480 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 481 void snd_pcm_vma_notify_data(void *client, void *data);
 482 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
 483
 484 #if BITS_PER_LONG >= 64
 485
 486 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 487 {
 488         *rem = *n % div;
 489         *n /= div;
 490 }
 491
 492 #elif defined(i386)
 493
 494 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 495 {
 496         u_int32_t low, high;
 497         low = *n & 0xffffffff;
 498         high = *n >> 32;
 499         if (high) {
 500                 u_int32_t high1 = high % div;
 501                 high /= div;
 502                 asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1));
 503                 *n = (u_int64_t)high << 32 | low;
 504         } else {
 505                 *n = low / div;
 506                 *rem = low % div;
 507         }
 508 }
 509 #else
 510
 511 static inline void divl(u_int32_t high, u_int32_t low,
 512                         u_int32_t div,
 513                         u_int32_t *q, u_int32_t *r)
 514 {
 515         u_int64_t n = (u_int64_t)high << 32 | low;
 516         u_int64_t d = (u_int64_t)div << 31;
 517         u_int32_t q1 = 0;
 518         int c = 32;
 519         while (n > 0xffffffffU) {
 520                 q1 <<= 1;
 521                 if (n >= d) {
 522                         n -= d;
 523                         q1 |= 1;
 524                 }
 525                 d >>= 1;
 526                 c--;
 527         }
 528         q1 <<= c;
 529         if (n) {
 530                 low = n;
 531                 *q = q1 | (low / div);
 532                 *r = low % div;
 533         } else {
 534                 *r = 0;
 535                 *q = q1;
 536         }
 537         return;
 538 }
 539
 540 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 541 {
 542         u_int32_t low, high;
 543         low = *n & 0xffffffff;
 544         high = *n >> 32;
 545         if (high) {
 546                 u_int32_t high1 = high % div;
 547                 u_int32_t low1 = low;
 548                 high /= div;
 549                 divl(high1, low1, div, &low, rem);
 550                 *n = (u_int64_t)high << 32 | low;
 551         } else {
 552                 *n = low / div;
 553                 *rem = low % div;
 554         }
 555 }
 556 #endif
 557
 558 /*
 559  *  PCM library
 560  */
 561
 562 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
 563 {
 564         return substream->group != &substream->self_group;
 565 }
 566
 567 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 568 {
 569         read_lock(&snd_pcm_link_rwlock);
 570         spin_lock(&substream->self_group.lock);
 571 }
 572
 573 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 574 {
 575         spin_unlock(&substream->self_group.lock);
 576         read_unlock(&snd_pcm_link_rwlock);
 577 }
 578
 579 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 580 {
 581         read_lock_irq(&snd_pcm_link_rwlock);
 582         spin_lock(&substream->self_group.lock);
 583 }
 584
 585 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 586 {
 587         spin_unlock(&substream->self_group.lock);
 588         read_unlock_irq(&snd_pcm_link_rwlock);
 589 }
 590
 591 #define snd_pcm_stream_lock_irqsave(substream, flags) \
 592 do { \
 593         read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
 594         spin_lock(&substream->self_group.lock); \
 595 } while (0)
 596
 597 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
 598 do { \
 599         spin_unlock(&substream->self_group.lock); \
 600         read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
 601 } while (0)
 602
 603 #define snd_pcm_group_for_each_entry(s, substream) \
 604         list_for_each_entry(s, &substream->group->substreams, link_list)
 605
 606 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 607 {
 608         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 609                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 610                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 611 }
 612
 613 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 614 {
 615         return size * 8 / runtime->sample_bits;
 616 }
 617
 618 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 619 {
 620         return size * 8 / runtime->frame_bits;
 621 }
 622
 623 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 624 {
 625         return size * runtime->sample_bits / 8;
 626 }
 627
 628 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 629 {
 630         return size * runtime->frame_bits / 8;
 631 }
 632
 633 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 634 {
 635         return bytes % runtime->byte_align == 0;
 636 }
 637
 638 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 639 {
 640         struct snd_pcm_runtime *runtime = substream->runtime;
 641         return frames_to_bytes(runtime, runtime->buffer_size);
 642 }
 643
 644 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 645 {
 646         struct snd_pcm_runtime *runtime = substream->runtime;
 647         return frames_to_bytes(runtime, runtime->period_size);
 648 }
 649
 650 /*
 651  *  result is: 0 ... (boundary - 1)
 652  */
 653 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 654 {
 655         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 656         if (avail < 0)
 657                 avail += runtime->boundary;
 658         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 659                 avail -= runtime->boundary;
 660         return avail;
 661 }
 662
 663 /*
 664  *  result is: 0 ... (boundary - 1)
 665  */
 666 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 667 {
 668         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 669         if (avail < 0)
 670                 avail += runtime->boundary;
 671         return avail;
 672 }
 673
 674 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 675 {
 676         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 677 }
 678
 679 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 680 {
 681         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 682 }
 683
 684 /**
 685  * snd_pcm_playback_ready - check whether the playback buffer is available
 686  * @substream: the pcm substream instance
 687  *
 688  * Checks whether enough free space is available on the playback buffer.
 689  *
 690  * Returns non-zero if available, or zero if not.
 691  */
 692 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 693 {
 694         struct snd_pcm_runtime *runtime = substream->runtime;
 695         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 696 }
 697
 698 /**
 699  * snd_pcm_capture_ready - check whether the capture buffer is available
 700  * @substream: the pcm substream instance
 701  *
 702  * Checks whether enough capture data is available on the capture buffer.
 703  *
 704  * Returns non-zero if available, or zero if not.
 705  */
 706 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 707 {
 708         struct snd_pcm_runtime *runtime = substream->runtime;
 709         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 710 }
 711
 712 /**
 713  * snd_pcm_playback_data - check whether any data exists on the playback buffer
 714  * @substream: the pcm substream instance
 715  *
 716  * Checks whether any data exists on the playback buffer. If stop_threshold
 717  * is bigger or equal to boundary, then this function returns always non-zero.
 718  *
 719  * Returns non-zero if exists, or zero if not.
 720  */
 721 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 722 {
 723         struct snd_pcm_runtime *runtime = substream->runtime;
 724
 725         if (runtime->stop_threshold >= runtime->boundary)
 726                 return 1;
 727         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 728 }
 729
 730 /**
 731  * snd_pcm_playback_empty - check whether the playback buffer is empty
 732  * @substream: the pcm substream instance
 733  *
 734  * Checks whether the playback buffer is empty.
 735  *
 736  * Returns non-zero if empty, or zero if not.
 737  */
 738 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 739 {
 740         struct snd_pcm_runtime *runtime = substream->runtime;
 741         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 742 }
 743
 744 /**
 745  * snd_pcm_capture_empty - check whether the capture buffer is empty
 746  * @substream: the pcm substream instance
 747  *
 748  * Checks whether the capture buffer is empty.
 749  *
 750  * Returns non-zero if empty, or zero if not.
 751  */
 752 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 753 {
 754         struct snd_pcm_runtime *runtime = substream->runtime;
 755         return snd_pcm_capture_avail(runtime) == 0;
 756 }
 757
 758 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
 759                                         struct snd_pcm_substream *master)
 760 {
 761         substream->runtime->trigger_master = master;
 762 }
 763
 764 static inline int hw_is_mask(int var)
 765 {
 766         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 767                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 768 }
 769
 770 static inline int hw_is_interval(int var)
 771 {
 772         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 773                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 774 }
 775
 776 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 777                                      snd_pcm_hw_param_t var)
 778 {
 779         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 780 }
 781
 782 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 783                                              snd_pcm_hw_param_t var)
 784 {
 785         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 786 }
 787
 788 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 789                                              snd_pcm_hw_param_t var)
 790 {
 791         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 792 }
 793
 794 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 795                                                      snd_pcm_hw_param_t var)
 796 {
 797         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 798 }
 799
 800 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
 801 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
 802 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
 803 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
 804 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
 805 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
 806 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
 807 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
 808 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
 809 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
 810
 811
 812 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 813 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 814 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 815 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 816                           unsigned int k, struct snd_interval *c);
 817 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 818                           const struct snd_interval *b, struct snd_interval *c);
 819 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
 820 int snd_interval_ratnum(struct snd_interval *i,
 821                         unsigned int rats_count, struct snd_ratnum *rats,
 822                         unsigned int *nump, unsigned int *denp);
 823
 824 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 825 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 826 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 827
 828 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 829
 830 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
 831 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
 832
 833 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 834                                u_int32_t mask);
 835 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 836                                  u_int64_t mask);
 837 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 838                                  unsigned int min, unsigned int max);
 839 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
 840 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
 841                                unsigned int cond,
 842                                snd_pcm_hw_param_t var,
 843                                struct snd_pcm_hw_constraint_list *l);
 844 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
 845                                   unsigned int cond,
 846                                   snd_pcm_hw_param_t var,
 847                                   struct snd_pcm_hw_constraint_ratnums *r);
 848 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
 849                                   unsigned int cond,
 850                                   snd_pcm_hw_param_t var,
 851                                   struct snd_pcm_hw_constraint_ratdens *r);
 852 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
 853                                  unsigned int cond,
 854                                  unsigned int width,
 855                                  unsigned int msbits);
 856 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
 857                                unsigned int cond,
 858                                snd_pcm_hw_param_t var,
 859                                unsigned long step);
 860 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
 861                                unsigned int cond,
 862                                snd_pcm_hw_param_t var);
 863 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
 864                         unsigned int cond,
 865                         int var,
 866                         snd_pcm_hw_rule_func_t func, void *private,
 867                         int dep, ...);
 868
 869 int snd_pcm_format_signed(snd_pcm_format_t format);
 870 int snd_pcm_format_unsigned(snd_pcm_format_t format);
 871 int snd_pcm_format_linear(snd_pcm_format_t format);
 872 int snd_pcm_format_little_endian(snd_pcm_format_t format);
 873 int snd_pcm_format_big_endian(snd_pcm_format_t format);
 874 #if 0 /* just for DocBook */
 875 /**
 876  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
 877  * @format: the format to check
 878  *
 879  * Returns 1 if the given PCM format is CPU-endian, 0 if
 880  * opposite, or a negative error code if endian not specified.
 881  */
 882 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
 883 #endif /* DocBook */
 884 #ifdef SNDRV_LITTLE_ENDIAN
 885 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
 886 #else
 887 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
 888 #endif
 889 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
 890 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
 891 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
 892 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
 893 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
 894 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
 895
 896 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
 897 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
 898 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
 899 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
 900                       unsigned int cmd, void *arg);
 901 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
 902 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
 903 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
 904 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
 905 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
 906 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
 907 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
 908 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
 909                                     const void __user *buf,
 910                                     snd_pcm_uframes_t frames);
 911 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
 912                                    void __user *buf, snd_pcm_uframes_t frames);
 913 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
 914                                      void __user **bufs, snd_pcm_uframes_t frames);
 915 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
 916                                     void __user **bufs, snd_pcm_uframes_t frames);
 917
 918 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
 919
 920 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
 921 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
 922
 923 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
 924                                               struct snd_dma_buffer *bufp)
 925 {
 926         struct snd_pcm_runtime *runtime = substream->runtime;
 927         if (bufp) {
 928                 runtime->dma_buffer_p = bufp;
 929                 runtime->dma_area = bufp->area;
 930                 runtime->dma_addr = bufp->addr;
 931                 runtime->dma_bytes = bufp->bytes;
 932         } else {
 933                 runtime->dma_buffer_p = NULL;
 934                 runtime->dma_area = NULL;
 935                 runtime->dma_addr = 0;
 936                 runtime->dma_bytes = 0;
 937         }
 938 }
 939
 940 /*
 941  *  Timer interface
 942  */
 943
 944 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
 945 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
 946 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
 947
 948 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
 949                                    struct timespec *tv)
 950 {
 951         if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
 952                 do_posix_clock_monotonic_gettime(tv);
 953         else
 954                 getnstimeofday(tv);
 955 }
 956
 957 /*
 958  *  Memory
 959  */
 960
 961 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
 962 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
 963 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
 964                                   int type, struct device *data,
 965                                   size_t size, size_t max);
 966 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
 967                                           int type, void *data,
 968                                           size_t size, size_t max);
 969 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
 970 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
 971
 972 #define snd_pcm_substream_sgbuf(substream) ((substream)->runtime->dma_buffer_p->private_data)
 973 #define snd_pcm_sgbuf_pages(size) snd_sgbuf_aligned_pages(size)
 974 #define snd_pcm_sgbuf_get_addr(sgbuf,ofs) snd_sgbuf_get_addr(sgbuf,ofs)
 975 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset);
 976
 977 /* handle mmap counter - PCM mmap callback should handle this counter properly */
 978 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
 979 {
 980         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
 981         atomic_inc(&substream->mmap_count);
 982 }
 983
 984 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
 985 {
 986         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
 987         atomic_dec(&substream->mmap_count);
 988 }
 989
 990 /* mmap for io-memory area */
 991 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
 992 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
 993 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
 994 #else
 995 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
 996 #define snd_pcm_lib_mmap_iomem  NULL
 997 #endif
 998
 999 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1000 {
1001         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1002 }
1003
1004 /*
1005  *  Misc
1006  */
1007
1008 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1009                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1010                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1011                                          (IEC958_AES3_CON_FS_48000<<24))
1012
1013 #endif /* __SOUND_PCM_H */